What Electrical‑Optical‑Electrical Simulation Changes for High‑Speed Links
Electrical‑Optical‑Electrical (EOE) simulation software is a design environment that models complete signal paths from electrical transmitters, through optical and photonic stages, back to electrical receivers, so engineers can validate cross‑domain behavior, signal integrity and nonlinear effects in one workflow instead of stitching together results from separate tools. Keysight’s new EOE capability in ADS 2026 squarely targets the mounting pressure on data links inside AI and high‑performance computing infrastructure, where optical connections are moving ever closer to CPUs, GPUs and high‑speed SerDes interfaces. As signaling speeds rise and optical reach extends across boards, modules and racks, the old split between SerDes design tools and photonics IC simulation breaks down. Engineers need a way to see how equalization, drivers, modulators, fibers and receivers interact as a single system, not as isolated design steps separated by manual data transfers.
Inside ADS 2026: A Unified Electrical and Optical Workflow
ADS 2026 introduces an EOE simulation flow that combines Keysight’s High Speed Digital workflow with Keysight Photonic Designer into a single co‑simulation environment. Instead of pushing eye diagrams or S‑parameters from SerDes design tools into standalone photonics IC simulation and back again, engineers can configure an end‑to‑end channel where electrical and optical envelope models run together. The flow supports system exploration, detailed circuit tuning and device‑level refinement, using process design kit support in ADS and component‑level modeling through Keysight RSoft integration. This means the same environment can cover architecture studies, link budgeting, photonic circuit optimization and final channel compliance. The result is shorter iteration cycles: channel engineers and photonics designers share a consistent model of the optical signal path, and every change in driver, modulator, waveguide or receiver can be checked immediately against overall system performance.
Modeling Signal Integrity Across Electrical‑Optical Boundaries
At the heart of the new EOE simulation software is its ability to expose issues that emerge only when both electrical and optical domains are modeled at once. Engineers can evaluate high‑speed SerDes channels alongside photonics IC behavior and see how driver rise times, package parasitics and modulator transfer functions combine to shape eye openings and jitter. Full‑duplex EOE channel models allow bidirectional optical links to be simulated in a single setup, capturing forward and backward propagation effects, including reflections. Noise sources are treated consistently across domains, so electrical noise, optical relative intensity noise and receiver noise can be examined together to estimate system‑level margins. End‑to‑end modeling also brings nonlinear effects into view, including modulator bias‑dependent behavior and large‑signal distortions that might otherwise appear only late in hardware testing, when fixes are expensive.
Multi‑Wavelength and Multi‑Lane Design for 800G and Beyond
As data center links scale, multi‑wavelength optical signal path modeling becomes essential. Keysight’s EOE capability supports wavelength division multiplexing so designers can study how nonlinearities develop across multiple carriers in a shared photonic IC or fiber. This is particularly relevant for multi‑lane interconnects at 800G and 1.6T, where crosstalk and nonlinear penalties can vary significantly between wavelengths. Engineering.com notes that “by 2029, 87% of hyperscale optical transceivers are expected to operate at 800Gbps or higher, with 1.6Tbps and 3.2Tbps links also emerging,” underscoring the need for accurate multi‑wavelength modeling. With a unified workflow, SerDes and photonics teams can evaluate equalization strategies, modulation formats, lane counts and wavelength plans side by side, instead of trying to reconcile separate electrical and photonics studies after the fact.
From Architecture to Components: Reshaping SerDes and Photonics Workflows
The broader impact of integrated EOE simulation is a rebalanced design process for SerDes and photonics IC teams. Architecture choices, such as whether to move a gearbox into the optical module or how aggressively to push lane speeds, can be assessed with realistic models of the photonic front‑end. At the same time, PDK‑based circuit design and RSoft‑driven component refinement keep device‑level constraints tied to system requirements. According to Engineering.com, the ADS 2026 EOE solution lets teams “review electrical and optical tradeoffs and check signal integrity earlier in the design process,” reducing late surprises at prototype. As optical links extend deeper into system topologies, this kind of unified photonics IC simulation and SerDes modeling is likely to become a standard part of high‑speed signal path design, not a specialized niche.